Daly emigrates from Ireland to the United States as a young boy, arriving in New York City. He sells newspapers and works his way to California in time to join the gold rush in what is to become Virginia City, Nevada, and the fabulously rich silver diggings now known as the Comstock Lode, in 1860.

Their business friendship extends for many years and helps establish the Anaconda Copper Mine in Butte, Montana. Daly originally comes to Butte in August 1876 to look at a mine, the Alice, as an agent for the Walker Bros. of Salt Lake City. The Walkers purchase the mine, install Daly as superintendent, and award him a fractional share of the mine.

Daly notices, while working underground in the Alice, that there are significant deposits of copper ore. He gains access into several other mines in the area and concludes that the hill is full of copper ore. He envisions an ore body several thousand feet deep, some veins of almost pure copper, and hundreds of millions of dollars. He urges his employers, the Walker Bros., to purchase the Anaconda and when they refrain, Daly purchases it himself. Daly finds his fortune on the Anaconda Copper Mine in Butte, after selling his small share of the Alice Mine for $30,000.

The Anaconda began as a silver mine, but Daly’s purchase is for the copper, found to be one of the largest deposits known at the time. However, he lacks the money to develop it, so he turned to Hearst, Haggin and Tevis. The first couple hundred feet within the mine are rich in silver, and took a few years to exhaust. By that time, Butte’s other silver mines are also playing out, so Daly closes the Anaconda, St. Lawrence, and Neversweat. Prices on surrounding properties drop and Daly purchases them. Then he re-opens the Anaconda. Due to Thomas Edison‘s development of the light bulb the world would need copper which is a very excellent conductor of electricity. Butte has copper, hundreds of thousands of tons of it, waiting to be taken from the ground.

He builds a smelter to handle the ore, and by the late 1880s, has become a millionaire several times over, and owner of the Anaconda Mining and Reduction Company. Daly owns a railroad, the Butte, Anaconda and Pacific Railroad, to haul ore from his mines to his smelter in Anaconda, a city he founds. He owns lumber interests in the Bitterroot Valley and a mansion and prized stables in the same valley, south of Missoula.

In 1894, Daly spearheads an energetic but unsuccessful campaign to have Anaconda designated as Montana’s state capital, but loses out to Helena. Daly is active in Montana politics throughout the 1890s, because of his opposition and intense rivalry with fellow copper king, and future U.S. Senator, William A. Clark. He attempts to keep Clark out of office by lavishly supporting his opponents.

In 1891, Daly becomes the owner of Tammany, said to be one of the world’s fastest racehorses in 1893. He also arranges the breeding of the great Sysonby, ranked number 30 in the top 100 U.S. thoroughbred champions of the 20th Century by The Blood-Horse magazine. However, Daly dies in New York City on November 12, 1900, before the horse is born.

Following his death, New York’s Madison Square Garden hosts a dispersal sale for the Bitterroot thoroughbred studs on January 31, 1901. One hundred eighty-five horses are sold for $405,525.